166181343 has 4 divisors (see below), whose sum is σ = 221575128. Its totient is φ = 110787560.

The previous prime is 166181221. The next prime is 166181363. The reversal of 166181343 is 343181661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 343181661 = 3 ⋅114393887.

It is a cyclic number.

It is not a de Polignac number, because 166181343 - 2¹⁰ = 166180319 is a prime.

It is a super-2 number, since 2×166181343² = 55232477522567298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166181363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27696888 + ... + 27696893.

It is an arithmetic number, because the mean of its divisors is an integer number (55393782).

Almost surely, 2^166181343 is an apocalyptic number.

166181343 is a deficient number, since it is larger than the sum of its proper divisors (55393785).

166181343 is an equidigital number, since it uses as much as digits as its factorization.

166181343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55393784.

The product of its digits is 10368, while the sum is 33.

The square root of 166181343 is about 12891.1342790307. The cubic root of 166181343 is about 549.7865210070.

The spelling of 166181343 in words is "one hundred sixty-six million, one hundred eighty-one thousand, three hundred forty-three".